Turns out being a metamorphmagus comes with a downside besides the clumsiness.
A susceptibility to dissociative identity disorder.
Harry couldn't understand why Tonks constantly flirts with him when her hair is pink. But glares at him as if he were a bug for her to step on when her hair is purple.
He began to suspect something was up, when one day, her hair was blue, and she had no idea who the hell he was.
Harry/Tonks
Tonks has multiple personalities.